Some standard content:
ICS.61.020
National Standard of the People's Republic of China
GB/T8878—2002
Replaces GB/T8878-1997
Cotton knitted underwear
Cotton knitted underwear
2002-09-05 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on 2003-02-01
GB/T 8878--2002
This standard was drafted based on ASTM 4234--2001, Standard Performance Specification for Knitted Dressing Gowns, Nightgowns, Nightgowns, Slips and Underwear Fabrics for Women, Adults and Children, and is not equivalent to ASTM 4234-2001. This standard replaces GB/T 8878--1997, Cotton knitted underwear. Compared with GB/T8878-1997, the main changes of this standard are as follows: -- The rules on referenced documents are revised to: distinguish between referenced documents with dates and those without dates (2 of the 1997 edition; 2 of this edition); -- Modify the provisions on product classification (4.1 of the 1997 edition; 4.2 of this edition); -- Adjust the provisions on surface defect evaluation and simplify their contents (4.1.4.3 of the 1997 edition; 4.4. 1.3);
Add the assessment items and test methods of fiber content, formaldehyde content and pH value (4.3, 5.4.6, 5.4.7 and 5.4.8 of this edition);-Cancel the assessment items and test methods of dry weight (4.2.1 and 5.3.1 of the 1997 edition);.-Change the shrinkage item to the washing size change rate, adjust some indicators, and modify their calculation methods (4.2.2 of the 1997 edition; 4.3 and 5.4.2.4.3 of this edition); Adjustment: - Add the assessment items and test methods for color fastness of pigment printing (4.2.1, 4.2.3 of the 1997 edition; 4.3, 5.4.3, 5.4.4 of this edition); - Add the measurement parts and regulations of ready-made garments (4, 4.2 of this edition); - Delete the assessment items of shoulder straps, vest shoulder straps, and shorts length in the specification size deviation (4.1.4.4 of the 1997 edition); - Add the assessment item of the difference in width of two shoulders in the inherent size difference (4.4.4 of this edition); Simplify the sewing requirements (4.3 of the 1997 edition; 4.4.5 of this edition). This standard is proposed by the China National Textile and Apparel Association. This standard is under the jurisdiction of the Knitwear Branch of the National Technical Committee for Textile Standardization. Drafting units of this standard: National Knitting Product Quality Supervision and Inspection Center, Shanghai Sanqiang Group Co., Ltd., Jiangsu AB Group Co., Ltd., Beijing Tongniu Knitting Group Co., Ltd., and Nantong Donghua Jiuding Knitting Garment Co., Ltd. The main drafters of this standard are Xing Zhigui, Wang Xinli, Xue Jifeng, Wu Xiaojing, Xu Peifang and Zuo Yao. This standard was first issued in 1964.
This standard replaces the previous versions of the standard: FJ 265~281-1964, FJ265-1973, GBn 1973~~1977-1979, GB 1808~1813-1979, FJn 442-1980. GB/T 8878--1988. GB/T 88808882-1988. GB/T 8878--1997. 122
1 Scope
Cotton knitted underwear
GB/T8878-2002
This standard specifies the product classification and size, requirements, test methods, judgment rules, product instructions, packaging, transportation and storage of cotton knitted underwear.
This standard is applicable to the identification of the quality of pure cotton knitted underwear. Cotton blended, interwoven and other knitted underwear can refer to this. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all referenced documents with dates, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all referenced documents without dates, the latest versions are applicable to this standard. GB250 Grey scale for assessing color change (GB250-1995, idtISO105-A02:1993) GB251 Grey scale for assessing staining (GB251-1995, idtISO105-A03:1993) GB/T2910 Quantitative chemical analysis method for two-component fiber blended products of textiles (GB/T2910-1997, eqvISO1833:1977
Quantitative chemical analysis method for three-component fiber blended products of textiles (GB/T2911-1997, eqvISO5088: GB/T 2911
GB/T 2912. 1
Determination of formaldehyde in textiles Part 1: Free and hydrolyzed formaldehyde (water extraction method) Textiles - Tests for color fastness - Color fastness to rubbing (GB/T3920--1997, eqv1SO105-X12: 1993) GB/T 3920
Textiles - Tests for color fastness - Color fastness to washing: Test 3 (GB/T3921.3-1997eqvIS)105GB/T3921.3
C03: 1989)
GB/T 3922
Textiles - Test method for color fastness to perspiration (GB/T3922-1995, eqvISO105-E04: 1994) GB/T4856 Knitted cotton fabric packaging
GB 5296. 4
Instructions for use of consumer productsInstructions for use of textiles and clothingGB/T 6411
GB/T 7573
Specifications and dimensions for cotton knitted underwear
Determination of pH value of aqueous extract of textiles
Rules for rounding off values
GB/T 8170
GB/T8629 Domestic washing and drying procedures for textile testing GB/T14801 Test methods for weft skew and bow in woven and knitted fabrics FZ/T01053 Textiles - fiber content identification FZ/T01057 (all parts) Test methods for identification of textile fibers FZ/T70004 Textile knitted fabric defect terminology FZ/T73011—1998 Knitted belly bands
3 Product classification and size
3.1 Cotton knitted underwear is divided into three categories according to the fabric structure: single-faced fabric, double-faced fabric and velvet fabric. 3.2 Cotton knitted underwear size shall be implemented in accordance with GB/T6411. 423
GB/T 8878---2002
4 Requirements
4.1 Requirements are divided into two aspects: intrinsic quality and appearance quality. Intrinsic quality includes ball bursting strength, fiber content, formaldehyde content, pH value, dimensional change rate after washing, color fastness to washing, color fastness to perspiration, color fastness to rubbing, color fastness to washing of paint printing, and color fastness to rubbing of paint printing. Appearance quality includes surface defects, specification size deviation, inherent size difference, and sewing regulations. 4.2 Grading rules
4.2.1 The quality grades of cotton knitted underwear are divided into superior products, first-class products, and qualified products. 4.2.2 Quality grading of cotton knitted underwear: intrinsic quality is graded by batch (delivery batch) and appearance quality is graded by piece. The combination of the two is graded at the lowest grade.
4.3 Intrinsic quality requirements
4.3.1 See Table 1 for intrinsic quality requirements.
Table 1 Intrinsic quality requirements
Ball bursting strength/N
Fiber content (net dry content)/(%)
Formaldehyde content/(mg/kg)
Dimensional change rate after washing/(%)
Colour fastness to washing/grade
Colour fastness to perspiration/grade
Colour fastness to rubbing/grade
Colour fastness to washing of pigment printing/grade
Colour fastness to rubbing of pigment printing/grade
Flannel fabric
Double-sided fabric
Single-sided fabric
Stretch fabric
Note: Infants and young children refer to those under 21 months old. Single-sided, ribbed fabric
Double-sided, velvet fabric
Vertical》
Vertical≥
Vertical≥
Vertical'》
Superior products
According to the provisions of FZ/T01053
Infants≤20Others≤75
-5. 0~ 0. 0
3(depth 2--3)
5.0～+3.0
~8.0～+2.0
-6. 5~+2.0
3-—4
2-—3(deep 2)
Qualified products
6. 0 ~ +3. 0
-10. 0 -- 2. 0
8.0~+2. 0
Two indicators are allowed
Half a level lower than the first-class products
The pin bursting strength index of products with jacquard and tuck structure may not be assessed (referring to products with striped and hollow fabrics). 4.3.2
4.3.3 The dimensional change rate after washing is not assessed for shorts products. 4.3.4 When the marked content of red fiber does not exceed 10%, its content shall not be less than 70% of its own content. 121
4.3.5 For wet rubbing color fastness index of level 2, it is not allowed to be lowered by half a level. 4.3.6 For each index of intrinsic quality, the lowest test result shall be used as the basis for the evaluation of the batch of products. 4.4 Appearance quality requirements
4.4.1 Appearance quality evaluation regulations
GB/T 8878--2002
4.4.1.1 The appearance quality evaluation is determined by the evaluation of surface defects, specification size deviation, inherent size difference, and sewing regulations. When appearance defects of different grades are found on a product, the lowest grade defect shall be used for evaluation. 4.4.1.2 Only two limit surface defects of the same grade are allowed to exist on the same product. If more than two limit surface defects are found, the grade shall be reduced by one grade. 4.4.1.3 The surface defect evaluation regulations are shown in Table 2. Table 2 Surface defect evaluation and classification regulations
Defect name
Coarse yarn, big belly yarn, oil yarn, colored yarn, face yarn jump, lining yarn exposed, long flower needle
Oil cotton flying
Crooked texture
Pulling and exposing the bottom, fluff removal, uneven raising, aurora print, color flower, wind collapse, folding print, printing defects (missing flower, exposed bottom, color matching, incorrect registration, etc.) Sewing oily line
Sewing twists and turns
Bottom edge missing needle
Bottom edge visible needle
Heavy needle (except single needle machine)
Light oil, dirty color stains
Dark oil, dirty color stains
Fine yarn, broken lining yarn, broken face yarn, single yarn, Repair scars, rust spots, yellowing, needle holes, holes. Superior products
Main parts: not allowed
Secondary parts: slight marks allowed
Main parts: not allowed
First-class products
Slight marks allowed
Secondary parts: 0.5cm for those without holes
Main parts: not allowed
Secondary parts: 1 needle 8cm for those who are not obvious. 4 levels between main materials
3-4 levels between main and auxiliary materials
No more than 6%
Main parts: not allowed
Secondary parts: slight marks allowed
4 levels between main materials
3 between main and auxiliary materials Level
Minor cases are allowed
Light 1cm three places or 2cm one place, 0.5 cm is not allowed in the collar
One stitch two places on each side, but not continuous, the saddle seam is sewn firmly, and the stitching does not exceed 1cm
Less than 0.2cm, 0.3cm at the saddle seam, and the length of one side does not exceed 3cm. Each process is limited to 4 except for reasonable joints. cm one place (excluding the collar area)
Main part: not allowed
Secondary part: two places in total
Main part: not allowed
Secondary part: two places in total
Main part: two places in total
Secondary part: three places in total
Not allowed
Qualified products
Obvious ones are allowed
No holes, two places of 0.5cm
or 1 cm 1 stitch is allowed for unobvious ones
15cm-place
3rd grade between main materials
23rd grade between main and auxiliary materials
Not more than 9%
Obvious ones are allowed
20cm for light ones.
10cm for darker ones
Not assessed
Limited to 4cm at two places
6cm in total
2cm in total
GB/T 8878—2002
Name of defects
Table 2 (continued)
Superior products
First-class products
Note 1: The main part refers to the two-thirds of the upper front of the jacket (including the exposed part of the collar). There is no main part for trousers. Note 2: Description of the degree of defects:
Slight... not obvious visually, can be seen only after careful identification. Obvious
- does not affect the overall effect, but the existence of defects can be felt. Qualified products
4.4.1.3.1 The length of the surface defects is measured by the longest length (diameter) of the defects. If there are thin stains (0.1cm and below), the length should be doubled according to the provisions of Table 2. 4.4.1.3.2 The length and number of surface defects are both maximum limit values. 4.4.1.3.3 Any surface defects not specified in the provisions shall be handled as appropriate with reference to similar defects. 4.4.1.3.4 Color difference shall be evaluated in accordance with GB250.
4.4.2 Measurement parts and regulations for ready-made garments
4.4.2.1 See Figure 1 for the measurement part of the top.
4.4.2.2 See Figure 2 for the measurement part 1 of the pants.
4.4.2.3Pants measurement part 1 See Figure 3.
4.4.2.4Vest measurement part See Figure 4.
-Length;
Chest width,
1---Single shoulder width;
5---Hanging shoulder.
Figure 1 Top measurement part
6.Pants length;
-Crotch;
8 Crossbar.
9.-Waist width.
1 ---Length;
2-Chest width;
10-Shoulder width.
5 The measurement parts of ready-made garments are specified in Table 3.
Pants measurement part 1
8cm~10cm
Figure 3 Pants measurement part II
Figure 4 Vest measurement part
GB/T 8878-2002
GB/T 8878--2002
Shoulder width
Table 3 Provisions for measurement parts of ready-made garments
Measurement method
Measure from the highest point of the shoulder seam to the bottom edge. For continuous shoulders, measure from the midpoint of the shoulder width to the bottom edge. 2 meters downward from the joint between the sleeve seam and the rib seam cm Horizontal measurement from the intersection of the shoulder seam and the sleeve seam to the cuff edge, raglan style from the middle of the back collar to the cuff From the highest point of the shoulder seam to the intersection of the shoulder seam and the sleeve seam The straight line distance from the shoulder to the armpit at the seam of the body and the sleeve 1/4 of the back waist width down to the trouser leg relative fold, from the waist edge down to the crotch corner trouser body relative fold, from the crotch corner horizontal measurement
Side waist 8cm ~ 10cm down horizontal measurement
Shoulder strap seam horizontal measurement
Note: The measurement value of each part is accurate to 0.1 cm. 4.4.3 Specification size deviation
See Table 4.
Table 4 Specification size deviation
Chest (waist) width
Superior products
Children, middle children
Note: For products with round shoulders or full body floral prints, the chest width deviation will increase by 0.5cm. 4.4.4
Differences in own dimensions
See Table 5.
Qualified products
Table 5 Differences in own dimensions
Length of clothing
Sleeve length--
Front and back body and left and right waist seams
Sleeve width--
Superior products
Superior products
First-class products
First-class products
Unit is centimeters
Qualified products
Unit is centimeters
Qualified products
Chest width is|| tt||Pants length is different
Shoulder is not||Shoulder width is not narrow
Vest shoulder straps are different
Vest chest and back are different
Upper and lower are not ~ (pagoda type)
The width of the front and back pieces is not ·
Leg width is not
4.4.5 Sewing regulations
Table 5 (continued)
Superior products
4.4.5.1Superior products, first-class products and qualified products shall comply with these regulations. First-class products
GB/T 8878—2002
Unit is cm
Qualified products
4.4.5.2 Reinforced parts: shoulder joint, crotch joint. The crotch seams can be reinforced with a four-thread or five-thread overlock sewing machine. The cuffs, collars, hems, trouser legs and rib seams should be reinforced with double needle stretch stitching or sewn with a four-thread or five-thread overlock sewing machine. 4.4.5.3 The stitches of the flat-sewing machine and overlock sewing machine should be reinforced at the edges. 4.4.5.4 The seams of the collar, sleeve edges and waist edges should be reinforced with a clamp (mouth). 4.4.5.5
Stitch density regulations are shown in Table 6.
Table 6 Stitch density regulations
Machine type (stitch number not less than)
Plush fabric
Double-sided fabric
Single-sided fabric
Flat double needle
4.4.5.6 Stitch density is measured at the middle of a sewing process. 4.4. 5.7
Unit is stitch number/2 cm
Buttonhole machine stitch density is measured by angle, not less than 8 stitches per cm, and not less than 2 stitches for each end. 4.4.5.8 The stitch density of button sewing machine is not less than .4 stitches per buttonhole. 4.4.5.9 The seam width of overlock sewing machine is not less than 0.3cm, four-thread is not less than 0.4cm, and five-thread is not less than 0.6cm. Wide and tight belt
4.4.5.10 The stitch density of sewing is lower than that specified in Table 6 and the skipped stitch of double-needle interlock sewing machine is 1 stitch scattered in 2 places, and 1 piece is calculated as 0.5 piece of missing defect. The skipped stitch of flat sewing machine is allowed to be 1 stitch scattered in 2 places. 5 Test method
5.1 Sampling quantity
5.1.1 For appearance quality, 1% to 3% of the items shall be randomly sampled according to the delivery batch, color, specification and size, but at least not less than 20 items. 5.1.2 For internal quality, 4 items shall be randomly sampled according to the delivery batch, color, specification and size. If the number is insufficient, the number of items can be increased. 5.2 Appearance quality inspection conditions
5.2.1 Generally, light inspection is adopted, using a 40W blue light or white light fluorescent lamp with a lampshade on it. The vertical distance between the lampshade and the center of the inspection table is 80cm±5cm.
5.2.2 If natural light is used for inspection indoors, the light source should be directed from the north to the upper left (or right) corner, and the sun should not shine directly on the product. 429
GB/T 8878—2002
5.2.3 During inspection, the product should be spread out on the inspection table, and a layer of white cloth should be spread on the table. The inspector should look directly at the surface of the product, and the distance between the eyes and the product should be more than 35cm.
5.3 Sample preparation and test conditions
5.3.1 The sample should not have defects that affect the test. 5.3.2 When conducting the marble bursting strength and water washing dimensional change test, the sample should be unfolded and laid flat for 20 hours at room temperature, and then placed for 4 hours in the test room at a temperature of (20±2))C and a relative humidity of (65±3)% before the test. 5.4 Test items
5.4.1 Ball bursting strength test
5.4.1.1 Instrument: Ball bursting strength tester, descending speed is 10cm/min～11cm/min, ball diameter is 2cm, inner diameter of the ring is 2.5cm.
5.4.1.2 Test operation: Take 5 samples from different parts of the garment, clamp the samples into the ring and make the front contact with the marbles for measurement. If the sample slips out of the ring during the test, the test result is invalid, and another sample should be taken for retest. After the sample is completely burst, the value indicated by the pointer is the strength data. The test result is the average value of the 5 samples and is accurate to the single digit. 5.4.2 Washing size change test
5.4.2.1 Instruments and tools
Automatic washing machine (horizontal drum front loading washing machine specified in GB/T8629), ruler (accurate to 0.1 cm), rod with a diameter of 2 cm to 3 cm. 5.4.2.2 Measuring parts
For tops, the body length and chest circumference are used as the vertical and horizontal measuring parts, and the body length is calculated based on the average of the front, back, left and right parts. For trousers, the trouser length and mid-leg are used as the vertical and horizontal measuring parts, and the trouser length is calculated based on the average of the left and right parts. And make marks when measuring to facilitate measurement after washing. The measuring parts of tops are shown in Figure 5, the measuring parts of pants are shown in Figure 6, and the measuring parts of vests are shown in Figure 7. 5cm
Measurement parts of tops before and after washing
Figure 6 Measurement parts of pants before and after washing
Figure 7 Measurement parts of vests before and after washing
5.4.2.3 See Table 7 for the description of the measurement parts for the dimensional change rate after washing.
Table 7 Measurement location of dimensional change after washing Description of category
5.4.2.4 Test operation
Measurement method
Measure from the middle point of shoulder width to the bottom edge for continuous shoulder, and from the highest point of shoulder to the bottom edge for closed shoulder (shoulder) Measure horizontally from 5 cm below the seam of sleeve ridge and rib seam Measure horizontally from the quarter of the back waist to the trouser hem Measure horizontally from 10 cm below the horizontal crotch measurement line (8 cm for children and middle children) GB/T 8878—2002
5.4.2.4.1 The dimensional change after washing test shall be carried out in accordance with the provisions of GB/T8629. Use 5A washing procedure. Number of test pieces: 3 pieces. 5.4.2.4.2 Drying: Use the hanging drying method. Use a rod to pass through the sleeves of the top to keep the chest hanging shoulder straight, and separate the two pieces from the bottom by hand. Fold the pants in half and hang them on the drying pole, with the horizontal part on the drying pole, and gently smooth them. Place the dried sample on a platform at a temperature of (20 ± 2) °C and a relative humidity of (65 ± 3)% for more than 4 hours, gently flatten the creases, and then measure. 5.4.2.4.3 Calculation and expression of results: Calculate the vertical or horizontal washing dimensional change rate according to formula (1), with a negative sign () indicating dimensional shrinkage and a positive sign (+) indicating dimensional elongation. The final result is rounded to the nearest 0.1. L1 = Lo × 100
Where:
A — vertical or horizontal washing dimensional change rate, %; L — the average value of the vertical or horizontal dimensions after washing; I. — the average value of the vertical or horizontal dimensions before washing. 5.4.3 The washing (including pigment printing) color fastness test shall be carried out in accordance with GB/T3921.3.
5.4.4 The test of color fastness to friction (including paint printing) shall be carried out in accordance with GB/T3920. The test shall be carried out in the vertical direction only. 5.4.5 The test of color fastness to perspiration
shall be carried out in accordance with GB/T3922.
5.4.6 The test of formaldehyde content
shall be carried out in accordance with GB/T2912.1. The test of special treatment products for printing and laminating shall be carried out on the printing and laminating parts. 5. 4. 7 pH value test
(1)
GB/T 8878 --2002
shall be carried out in accordance with GB/T7573.
5.4.8 The test of fiber content
shall be carried out in accordance with G3/T2910, GB/T2911, FZ/T01057 and FZ/T.73011. 5.4.9 Color fastness rating
Evaluate according to GB250 and GB251.
5.4.10 Grain skew test
Perform according to GB/T14801.
6 Judgment rules
6.1 Appearance quality
Calculate the non-conforming product rate according to the variety, color, specification and size. If the non-conforming product rate is within 5.0%, the batch of products is judged to be qualified; if the non-conforming product rate is above 5.0%, the batch of products is judged to be unqualified. The inner packaging mark error is calculated by piece, and the outer packaging error is not allowed. 6.2 Inner quality
6.2.1 The arithmetic mean of all the tested samples is taken for the marble bursting strength. If qualified, the batch of products is judged to be qualified. If unqualified, the batch of products is judged to be unqualified.
6.2.2 The arithmetic mean of all samples after washing shall be taken as the test result, and the average qualified shall be qualified. If there are shrinkage and reverse swelling test results at the same time, the arithmetic mean of the two shrinkage (or reverse swelling) samples shall be taken as the test result. If qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified. 6.2.3 If the fiber content, formaldehyde content and pH value test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.2.4 If the washing, perspiration and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified according to color.
6.2.5 If the washing and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.3 Re-inspection
6.3.1 When any party objects to the inspection results, or when the product is not accepted at the time of delivery, a re-inspection may be requested for all the items of objection within the prescribed period.
6.3.2 When requesting a re-inspection, the entire quantity requested for re-inspection must be retained. 6.3.3 The inspection quantity during re-inspection shall be twice the inspection quantity during acceptance. The re-inspection results shall be handled in accordance with the provisions of 6.1 to 6.2 of this standard, and the re-inspection results shall prevail.
7 Product instructions, packaging, transportation, and storage 7.1 The product instructions shall be in accordance with GB5296.4. 7.2 Packaging shall be in accordance with GB/T4856 or the enterprise's own requirements. 7.3 The transportation of products shall be moisture-proof, fire-proof, and pollution-proof. 7.4 Products shall be stored in a cool, ventilated, dry, and clean warehouse, and shall be protected from moths and tinea. 4324 The product should be stored in a cool, ventilated, dry and clean warehouse and protected from moth and ringworm.4 The product should be stored in a cool, ventilated, dry and clean warehouse and protected from moth and ringworm.4 The product should be stored in a cool, ventilated, dry and clean warehouse and protected from moth and ringworm.4 The product should be stored in a cool, ventilated, dry and clean warehouse and protected from moth and ringworm.4 The product should be stored in a cool, ventilated, dry and clean warehouse and protected from moth and ringworm.4 The product should be stored in a cool, ventilated, dry and clean warehouse and protected from moth and ringworm.7
Unit is number of stitches/2cm
The stitch density of buttonhole machine is measured by angle, not less than 8 stitches per centimeter, and not less than 2 stitches for bar tacks at both ends. 4.4.5.8 The stitch density of buttonhole machine is not less than .4 stitches per buttonhole. 4.4.5.9 The seam width of overlock machine is not less than 0.3cm, four-thread is not less than 0.4cm, and five-thread is not less than 0.6cm. Wide band
4.4.5.10 The stitch density of sewing is lower than that specified in Table 6 and the skipped stitch of double-needle interlock machine is 1 stitch scattered in 2 places, 1 piece is calculated as 0.5 piece of missing defect, and the skipped stitch of flat-bed sewing machine is allowed to be 1 stitch scattered in 2 places. 5 Test method
5.1 Sampling quantity
5.1.1 Appearance quality is randomly sampled according to the delivery batch by type, color, specification and size, 1% to 3%, but at least not less than 20 pieces. 5.1.2 Inner quality: 4 pieces are randomly sampled according to the delivery batch, color, specification and size. If the number is insufficient, the number of pieces can be increased. 5.2 Appearance quality inspection conditions
5.2.1 Generally, light inspection is adopted. A 40W blue light or white light fluorescent lamp is used, and a lampshade is added on it. The vertical distance between the lampshade and the center of the inspection table is 80cm±5cm.
5.2.2 If natural light is used for inspection indoors, the light source is directed from the north to the upper left (or right) corner, and the sun cannot shine directly on the product. 429
GB/T 8878—2002
5.2.3 During inspection, the product should be spread flat on the inspection table, and a layer of white cloth should be spread on the table. The inspector's line of sight should face the surface of the product, and the distance between the eyes and the product should be more than 35cm.
5.3 Sample preparation and test conditions
5.3.1 The sample taken should not have defects that affect the test. 5.3.2 When conducting the test of ball bursting strength and washing dimensional change rate, the sample needs to be unfolded and laid flat at room temperature for 20 hours, and then placed in the test room at a temperature of (20±2))C and a relative humidity of (65±3)% for 4 hours before the test. 5.4 Test items
5.4.1 Ball bursting strength test
5.4.1.1 Instrument: ball bursting strength machine, the descending speed is 10cm/min~11cm/min, the ball diameter is 2cm, and the inner diameter of the ring is 2.5cm.
5.4.1.2 Test operation: Take 5 samples from different parts of the garment, clamp the sample in the ring and then make the front contact with the ball for measurement. If the sample slips out of the ring during the test, the test result is invalid, and another sample should be taken for re-testing. After the sample is completely burst, the value indicated by the pointer is the strength data. The test result is the average of 5 samples and is accurate to the single digit. 5.4.2 Washing size change test
5.4.2.1 Instruments and tools
Automatic washing machine (horizontal drum front loading washing machine specified in GB/T8629), ruler (accurate to 0.1 cm), rod with a diameter of 2 cm to 3 cm. 5.4.2.2 Measuring parts
For tops, the body length and chest circumference are used as the vertical and horizontal measuring parts, and the average of the front, back, left and right sides of the body length is used as the basis for calculation. For pants, the trouser length and mid-leg are used as the vertical and horizontal measuring parts, and the trouser length is calculated based on the average of the left and right sides. And make marks when measuring to facilitate measurement after washing. The measuring parts of tops are shown in Figure 5, the measuring parts of pants are shown in Figure 6, and the measuring parts of vests are shown in Figure 7. 5cm
Measurement parts of tops before and after washing
Figure 6 Measurement parts of pants before and after washing
Figure 7 Measurement parts of vests before and after washing
5.4.2.3 See Table 7 for the description of the measurement parts for the dimensional change rate after washing.
Table 7 Measurement location of dimensional change after washing Description of category
5.4.2.4 Test operation
Measurement method
Measure from the middle point of shoulder width to the bottom edge for continuous shoulder, and from the highest point of shoulder to the bottom edge for closed shoulder (shoulder) Measure horizontally from 5 cm below the seam of sleeve ridge and rib seam Measure horizontally from the quarter of the back waist to the trouser hem Measure horizontally from 10 cm below the horizontal crotch measurement line (8 cm for children and middle children) GB/T 8878—2002
5.4.2.4.1 The dimensional change after washing test shall be carried out in accordance with the provisions of GB/T8629. Use 5A washing procedure. Number of test pieces: 3 pieces. 5.4.2.4.2 Drying: Use the hanging drying method. Use a rod to pass through the sleeves of the top to keep the chest hanging shoulder straight, and separate the two pieces from the bottom by hand. Fold the pants in half and hang them on the drying pole, with the horizontal part on the drying pole, and gently smooth them. Place the dried sample on a platform at a temperature of (20 ± 2) °C and a relative humidity of (65 ± 3)% for more than 4 hours, gently flatten the creases, and then measure. 5.4.2.4.3 Calculation and expression of results: Calculate the vertical or horizontal washing dimensional change rate according to formula (1), with a negative sign () indicating dimensional shrinkage and a positive sign (+) indicating dimensional elongation. The final result is rounded to the nearest 0.1. L1 = Lo × 100
Where:
A — vertical or horizontal washing dimensional change rate, %; L — the average value of the vertical or horizontal dimensions after washing; I. — the average value of the vertical or horizontal dimensions before washing. 5.4.3 The washing (including pigment printing) color fastness test shall be carried out in accordance with GB/T3921.3.
5.4.4 The test of color fastness to friction (including paint printing) shall be carried out in accordance with GB/T3920. The test shall be carried out in the vertical direction only. 5.4.5 The test of color fastness to perspiration
shall be carried out in accordance with GB/T3922.
5.4.6 The test of formaldehyde content
shall be carried out in accordance with GB/T2912.1. The test of special treatment products for printing and laminating shall be carried out on the printing and laminating parts. 5. 4. 7 pH value test
(1)
GB/T 8878 --2002
shall be carried out in accordance with GB/T7573.
5.4.8 The test of fiber content
shall be carried out in accordance with G3/T2910, GB/T2911, FZ/T01057 and FZ/T.73011. 5.4.9 Color fastness rating
Evaluate according to GB250 and GB251.
5.4.10 Grain skew test
Perform according to GB/T14801.
6 Judgment rules
6.1 Appearance qualityWww.bzxZ.net
Calculate the non-conforming product rate according to the variety, color, specification and size. If the non-conforming product rate is within 5.0%, the batch of products is judged to be qualified; if the non-conforming product rate is above 5.0%, the batch of products is judged to be unqualified. The inner packaging mark error is calculated by piece, and the outer packaging error is not allowed. 6.2 Inner quality
6.2.1 The arithmetic mean of all the tested samples is taken for the marble bursting strength. If qualified, the batch of products is judged to be qualified. If unqualified, the batch of products is judged to be unqualified.
6.2.2 The arithmetic mean of all samples after washing shall be taken as the test result, and the average qualified shall be qualified. If there are shrinkage and reverse swelling test results at the same time, the arithmetic mean of the two shrinkage (or reverse swelling) samples shall be taken as the test result. If qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified. 6.2.3 If the fiber content, formaldehyde content and pH value test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.2.4 If the washing, perspiration and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified according to color.
6.2.5 If the washing and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.3 Re-inspection
6.3.1 When any party objects to the inspection results, or when the product is not accepted at the time of delivery, a re-inspection may be requested for all the items of objection within the prescribed period.
6.3.2 When requesting a re-inspection, the entire quantity requested for re-inspection must be retained. 6.3.3 The inspection quantity during re-inspection shall be twice the inspection quantity during acceptance. The re-inspection results shall be handled in accordance with the provisions of 6.1 to 6.2 of this standard, and the re-inspection results shall prevail.
7 Product instructions, packaging, transportation, and storage 7.1 The product instructions shall be in accordance with GB5296.4. 7.2 Packaging shall be in accordance with GB/T4856 or the enterprise's own requirements. 7.3 The transportation of products shall be moisture-proof, fire-proof, and pollution-proof. 7.4 Products shall be stored in a cool, ventilated, dry, and clean warehouse, and shall be protected from moths and tinea. 4327
Unit is number of stitches/2cm
The stitch density of buttonhole machine is measured by angle, not less than 8 stitches per centimeter, and not less than 2 stitches for bar tacks at both ends. 4.4.5.8 The stitch density of buttonhole machine is not less than .4 stitches per buttonhole. 4.4.5.9 The seam width of overlock machine is not less than 0.3cm, four-thread is not less than 0.4cm, and five-thread is not less than 0.6cm. Wide band
4.4.5.10 The stitch density of sewing is lower than that specified in Table 6 and the skipped stitch of double-needle interlock machine is 1 stitch scattered in 2 places, 1 piece is calculated as 0.5 piece of missing defect, and the skipped stitch of flat-bed sewing machine is allowed to be 1 stitch scattered in 2 places. 5 Test method
5.1 Sampling quantity
5.1.1 Appearance quality is randomly sampled according to the delivery batch by type, color, specification and size, 1% to 3%, but at least not less than 20 pieces. 5.1.2 Inner quality: 4 pieces are randomly sampled according to the delivery batch, color, specification and size. If the number is insufficient, the number of pieces can be increased. 5.2 Appearance quality inspection conditions
5.2.1 Generally, light inspection is adopted. A 40W blue light or white light fluorescent lamp is used, and a lampshade is added on it. The vertical distance between the lampshade and the center of the inspection table is 80cm±5cm.
5.2.2 If natural light is used for inspection indoors, the light source is directed from the north to the upper left (or right) corner, and the sun cannot shine directly on the product. 429
GB/T 8878—2002
5.2.3 During inspection, the product should be spread flat on the inspection table, and a layer of white cloth should be spread on the table. The inspector's line of sight should face the surface of the product, and the distance between the eyes and the product should be more than 35cm.
5.3 Sample preparation and test conditions
5.3.1 The sample taken should not have defects that affect the test. 5.3.2 When conducting the test of ball bursting strength and washing dimensional change rate, the sample needs to be unfolded and laid flat at room temperature for 20 hours, and then placed in the test room at a temperature of (20±2))C and a relative humidity of (65±3)% for 4 hours before the test. 5.4 Test items
5.4.1 Ball bursting strength test
5.4.1.1 Instrument: ball bursting strength machine, the descending speed is 10cm/min~11cm/min, the ball diameter is 2cm, and the inner diameter of the ring is 2.5cm.
5.4.1.2 Test operation: Take 5 samples from different parts of the garment, clamp the sample in the ring and then make the front contact with the ball for measurement. If the sample slips out of the ring during the test, the test result is invalid, and another sample should be taken for re-testing. After the sample is completely burst, the value indicated by the pointer is the strength data. The test result is the average of 5 samples and is accurate to the single digit. 5.4.2 Washing size change test
5.4.2.1 Instruments and tools
Automatic washing machine (horizontal drum front loading washing machine specified in GB/T8629), ruler (accurate to 0.1 cm), rod with a diameter of 2 cm to 3 cm. 5.4.2.2 Measuring parts
For tops, the body length and chest circumference are used as the vertical and horizontal measuring parts, and the average of the front, back, left and right sides of the body length is used as the basis for calculation. For pants, the trouser length and mid-leg are used as the vertical and horizontal measuring parts, and the trouser length is calculated based on the average of the left and right sides. And make marks when measuring to facilitate measurement after washing. The measuring parts of tops are shown in Figure 5, the measuring parts of pants are shown in Figure 6, and the measuring parts of vests are shown in Figure 7. 5cm
Measurement parts of tops before and after washing
Figure 6 Measurement parts of pants before and after washing
Figure 7 Measurement parts of vests before and after washing
5.4.2.3 See Table 7 for the description of the measurement parts for the dimensional change rate after washing.
Table 7 Measurement location of dimensional change after washing Description of category
5.4.2.4 Test operation
Measurement method
Measure from the middle point of shoulder width to the bottom edge for continuous shoulder, and from the highest point of shoulder to the bottom edge for closed shoulder (shoulder) Measure horizontally from 5 cm below the seam of sleeve ridge and rib seam Measure horizontally from the quarter of the back waist to the trouser hem Measure horizontally from 10 cm below the horizontal crotch measurement line (8 cm for children and middle children) GB/T 8878—2002
5.4.2.4.1 The dimensional change after washing test shall be carried out in accordance with the provisions of GB/T8629. Use 5A washing procedure. Number of test pieces: 3 pieces. 5.4.2.4.2 Drying: Use the hanging drying method. Use a rod to pass through the sleeves of the top to keep the chest hanging shoulder straight, and separate the two pieces from the bottom by hand. Fold the pants in half and hang them on the drying pole, with the horizontal part on the drying pole, and gently smooth them. Place the dried sample on a platform at a temperature of (20 ± 2) °C and a relative humidity of (65 ± 3)% for more than 4 hours, gently flatten the creases, and then measure. 5.4.2.4.3 Calculation and expression of results: Calculate the vertical or horizontal washing dimensional change rate according to formula (1), with a negative sign () indicating dimensional shrinkage and a positive sign (+) indicating dimensional elongation. The final result is rounded to the nearest 0.1. L1 = Lo × 100
Where:
A — vertical or horizontal washing dimensional change rate, %; L — the average value of the vertical or horizontal dimensions after washing; I. — the average value of the vertical or horizontal dimensions before washing. 5.4.3 The washing (including pigment printing) color fastness test shall be carried out in accordance with GB/T3921.3.
5.4.4 The test of color fastness to friction (including paint printing) shall be carried out in accordance with GB/T3920. The test shall be carried out in the vertical direction only. 5.4.5 The test of color fastness to perspiration
shall be carried out in accordance with GB/T3922.
5.4.6 The test of formaldehyde content
shall be carried out in accordance with GB/T2912.1. The test of special treatment products for printing and laminating shall be carried out on the printing and laminating parts. 5. 4. 7 pH value test
(1)
GB/T 8878 --2002
shall be carried out in accordance with GB/T7573.
5.4.8 The test of fiber content
shall be carried out in accordance with G3/T2910, GB/T2911, FZ/T01057 and FZ/T.73011. 5.4.9 Color fastness rating
Evaluate according to GB250 and GB251.
5.4.10 Grain skew test
Perform according to GB/T14801.
6 Judgment rules
6.1 Appearance quality
Calculate the non-conforming product rate according to the variety, color, specification and size. If the non-conforming product rate is within 5.0%, the batch of products is judged to be qualified; if the non-conforming product rate is above 5.0%, the batch of products is judged to be unqualified. The inner packaging mark error is calculated by piece, and the outer packaging error is not allowed. 6.2 Inner quality
6.2.1 The arithmetic mean of all the tested samples is taken for the marble bursting strength. If qualified, the batch of products is judged to be qualified. If unqualified, the batch of products is judged to be unqualified.
6.2.2 The arithmetic mean of all samples after washing shall be taken as the test result, and the average qualified shall be qualified. If there are shrinkage and reverse swelling test results at the same time, the arithmetic mean of the two shrinkage (or reverse swelling) samples shall be taken as the test result. If qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified. 6.2.3 If the fiber content, formaldehyde content and pH value test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.2.4 If the washing, perspiration and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified according to color.
6.2.5 If the washing and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.3 Re-inspection
6.3.1 When any party objects to the inspection results, or when the product is not accepted at the time of delivery, a re-inspection may be requested for all the items of objection within the prescribed period.
6.3.2 When requesting a re-inspection, the entire quantity requested for re-inspection must be retained. 6.3.3 The inspection quantity during re-inspection shall be twice the inspection quantity during acceptance. The re-inspection results shall be handled in accordance with the provisions of 6.1 to 6.2 of this standard, and the re-inspection results shall prevail.
7 Product instructions, packaging, transportation, and storage 7.1 The product instructions shall be in accordance with GB5296.4. 7.2 Packaging shall be in accordance with GB/T4856 or the enterprise's own requirements. 7.3 The transportation of products shall be moisture-proof, fire-proof, and pollution-proof. 7.4 Products shall be stored in a cool, ventilated, dry, and clean warehouse, and shall be protected from moths and tinea. 43210 If the sewing stitch density is lower than the requirements in Table 6 and the skipped stitches of the double-needle interlock sewing machine are scattered in 2 places, 1 piece will be calculated as 0.5 piece of missing defects, and the skipped stitches of the lockstitch sewing machine are allowed to be scattered in 2 places. 5 Test method
5.1 Sampling quantity
5.1.1 For appearance quality, 1% to 3% will be randomly sampled according to the delivery batch, by type, color, specification and size, but at least not less than 20 pieces. 5.1.2 For internal quality, 4 pieces will be randomly sampled according to the delivery batch, by type, color, specification and size. If the number is insufficient, the number of pieces can be increased. 5.2 Appearance quality inspection conditions
5.2.1 Generally, light inspection is adopted, using a 40W blue light or white light fluorescent lamp with a lampshade on it. The vertical distance between the lampshade and the center of the inspection table is 80cm±5 cm.
5.2.2 If natural light is used for inspection indoors, the light source should be directed to the upper left (or right) corner of the north, and the sun should not be allowed to shine directly on the product. 429
GB/T 8878—2002
5.2.3 During the inspection, the product should be spread out on the inspection table, and a layer of white cloth should be spread on the table. The inspector should look directly at the surface of the product, and the distance between the eyes and the product should be more than 35cm.
5.3 Sample preparation and test conditions
5.3.1 The sample should not have defects that affect the test. 5.3.2 When conducting the marble bursting strength and water washing dimensional change test, the sample should be unfolded and laid flat at room temperature for 20 hours, and then placed in the test room at a temperature of (20±2))C and a relative humidity of (65±3)% for 4 hours before the test. 5.4 Test items
5.4.1 Ball bursting strength test
5.4.1.1 Instrument: Ball bursting strength tester, descending speed is 10cm/min～11cm/min, ball diameter is 2cm, inner diameter of the ring is 2.5cm.
5.4.1.2 Test operation: Take 5 samples from different parts of the garment, clamp the samples into the ring and make the front contact with the marbles for measurement. If the sample slips out of the ring during the test, the test result is invalid, and another sample should be taken for retest. After the sample is completely burst, the value indicated by the pointer is the strength data. The test result is the average value of the 5 samples and is accurate to the single digit. 5.4.2 Washing size change test
5.4.2.1 Instruments and tools
Automatic washing machine (horizontal drum front loading washing machine specified in GB/T8629), ruler (accurate to 0.1 cm), rod with a diameter of 2 cm to 3 cm. 5.4.2.2 Measuring parts
For tops, the body length and chest circumference are used as the vertical and horizontal measuring parts, and the body length is calculated based on the average of the front, back, left and right parts. For trousers, the trouser length and mid-leg are used as the vertical and horizontal measuring parts, and the trouser length is calculated based on the average of the left and right parts. And make marks when measuring to facilitate measurement after washing. The measuring parts of tops are shown in Figure 5, the measuring parts of pants are shown in Figure 6, and the measuring parts of vests are shown in Figure 7. 5cm
Measurement parts of tops before and after washing
Figure 6 Measurement parts of pants before and after washing
Figure 7 Measurement parts of vests before and after washing
5.4.2.3 See Table 7 for the description of the measurement parts for the dimensional change rate after washing.
Table 7 Measurement location of dimensional change after washing Description of category
5.4.2.4 Test operation
Measurement method
Measure from the middle point of shoulder width to the bottom edge for continuous shoulder, and from the highest point of shoulder to the bottom edge for closed shoulder (shoulder) Measure horizontally from 5 cm below the seam of sleeve ridge and rib seam Measure horizontally from the quarter of the back waist to the trouser hem Measure horizontally from 10 cm below the horizontal crotch measurement line (8 cm for children and middle children) GB/T 8878—2002
5.4.2.4.1 The dimensional change after washing test shall be carried out in accordance with the provisions of GB/T8629. Use 5A washing procedure. Number of test pieces: 3 pieces. 5.4.2.4.2 Drying: Use the hanging drying method. Use a rod to pass through the sleeves of the top to keep the chest hanging shoulder straight, and separate the two pieces from the bottom by hand. Fold the pants in half and hang them on the drying pole, with the horizontal part on the drying pole, and gently smooth them. Place the dried sample on a platform at a temperature of (20 ± 2) °C and a relative humidity of (65 ± 3)% for more than 4 hours, gently flatten the creases, and then measure. 5.4.2.4.3 Calculation and expression of results: Calculate the vertical or horizontal washing dimensional change rate according to formula (1), with a negative sign () indicating dimensional shrinkage and a positive sign (+) indicating dimensional elongation. The final result is rounded to the nearest 0.1. L1 = Lo × 100
Where:
A — vertical or horizontal washing dimensional change rate, %; L — the average value of the vertical or horizontal dimensions after washing; I. — the average value of the vertical or horizontal dimensions before washing. 5.4.3 The washing (including pigment printing) color fastness test shall be carried out in accordance with GB/T3921.3.
5.4.4 The test of color fastness to friction (including paint printing) shall be carried out in accordance with GB/T3920. The test shall be carried out in the vertical direction only. 5.4.5 The test of color fastness to perspiration
shall be carried out in accordance with GB/T3922.
5.4.6 The test of formaldehyde content
shall be carried out in accordance with GB/T2912.1. The test of special treatment products for printing and laminating shall be carried out on the printing and laminating parts. 5. 4. 7 pH value test
(1)
GB/T 8878 --2002
shall be carried out in accordance with GB/T7573.
5.4.8 The test of fiber content
shall be carried out in accordance with G3/T2910, GB/T2911, FZ/T01057 and FZ/T.73011. 5.4.9 Color fastness rating
Evaluate according to GB250 and GB251.
5.4.10 Grain skew test
Perform according to GB/T14801.
6 Judgment rules
6.1 Appearance quality
Calculate the non-conforming product rate according to the variety, color, specification and size. If the non-conforming product rate is within 5.0%, the batch of products is judged to be qualified; if the non-conforming product rate is above 5.0%, the batch of products is judged to be unqualified. The inner packaging mark error is calculated by piece, and the outer packaging error is not allowed. 6.2 Inner quality
6.2.1 The arithmetic mean of all the tested samples is taken for the marble bursting strength. If qualified, the batch of products is judged to be qualified. If unqualified, the batch of products is judged to be unqualified.
6.2.2 The arithmetic mean of all samples after washing shall be taken as the test result, and the average qualified shall be qualified. If there are shrinkage and reverse swelling test results at the same time, the arithmetic mean of the two shrinkage (or reverse swelling) samples shall be taken as the test result. If qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified. 6.2.3 If the fiber content, formaldehyde content and pH value test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.2.4 If the washing, perspiration and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified according to color.
6.2.5 If the washing and rubbing color fastness test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified.
6.3 Re-inspection
6.3.1 When any party objects to the inspection results, or when the product is not accepted at the time of delivery, a re-inspection may be requested for all the items of objection within the prescribed period.
6.3.2 When requesting a re-inspection, the entire quantity requested for re-inspection must be retained. 6.3.3 The inspection quantity during re-inspection shall be twice the inspection quantity during acceptance. The re-inspection results shall be handled in accordance with the provisions of 6.1 to 6.2 of this standard, and the re-inspection results shall prevail.
7 Product instructions, packaging, transportation, and storage 7.1 The product instructions shall be in accordance with GB5296.4. 7.2 Packaging shall be in accordance with GB/T4856 or the enterprise's own requirements. 7.3 The transportation of products shall be moisture-proof, fire-proof, and pollution-proof. 7.4 Products shall be stored in a cool, ventilated, dry, and clean warehouse, and shall be protected from moths and tinea. 43210 If the sewing stitch density is lower than the requirements in Table 6 and the skipped stitches of the double-needle interlock sewing machine are scattered in 2 places, 1 piece will be calculated as 0.5 piece of missing defects, and the skipped stitches of the lockstitch sewing machine are allowed to be scattered in 2 places. 5 Test method
5.1 Sampling quantity
5.1.1 For appearance quality, 1% to 3% will be randomly sampled according to the delivery batch, by type, color, specification and size, but at least not less than 20 pieces. 5.1.2 For internal quality, 4 pieces will be randomly sampled according to the delivery batch, by type, color, specification and size. If the number is insufficient, the number of pieces can be increased. 5.2 Appearance quality inspection conditions
5.2.1 Generally, light inspection is adopted, using a 40W blue light or white light fluorescent lamp with a lampshade on it. The vertical distance between the lampshade and the center of the inspection table is 80cm±5 cm.
5.2.2 If natural light is used for inspection indoors, the light source should be directed to the upper left (or right) corner of the north, and the sun should not be allowed to shine directly on the product. 429
GB/T 8878—2002
5.2.3 During the inspection, the product should be spread out on the inspection table, and a layer of white cloth should be spread on the table. The inspector should look directly at the surface of the product, and the distance between the eyes and the product should be more than 35cm.
5.3 Sample preparation and test conditions
5.3.1 The sample should not have defects that affect the test. 5.3.2 When conducting the marble bursting strength and water washing dimensional change test, the sample should be unfolded and laid flat at room temperature for 20 hours, and then placed in the test room at a temperature of (20±2))C and a relative humidity of (65±3)% for 4 hours before the test. 5.4 Test items
5.4.1 Ball bursting strength test
5.4.1.1 Instrument: Ball bursting strength tester, descending speed is 10cm/min～11cm/min, ball diameter is 2cm, inner diameter of the ring is 2.5cm.
5.4.1.2 Test operation: Take 5 samples from different parts of the garment, clamp the samples into the ring and make the front contact with the marbles for measurement. If the sample slips out of the ring during the test, the test result is invalid, and another sample should be taken for retest. After the sample is completely burst, the value indicated by the pointer is the strength data. The test result is the average value of the 5 samples and is accurate to the single digit. 5.4.2 Washing size change test
5.4.2.1 Instruments and tools
Automatic washing machine (horizontal drum front loading washing machine specified in GB/T8629), ruler (accurate to 0.1 cm), rod with a diameter of 2 cm to 3 cm. 5.4.2.2 Measuring parts
For tops, the body length and chest circumference are used as the vertical and horizontal measuring parts, and the body length is calculated based on the average of the front, back, left and right parts. For trousers, the trouser length and mid-leg are used as the vertical and horizontal measuring parts, and the trouser length is calculated based on the average of the left and right parts. And make marks when measuring to facilitate measurement after washing. The measuring parts of tops are shown in Figure 5, the measuring parts of pants are shown in Figure 6, and the measuring parts of vests are shown in Figure 7. 5cm
Measurement parts of tops before and after washing
Figure 6 Measurement parts of pants before and after washing
Figure 7 Measurement parts of vests before and after washing
5.4.2.3 See Table 7 for the description of the measurement parts for the dimensional change rate after washing.
Table 7 Measurement location of dimensional change after washing Description of category
5.4.2.4 Test operation
Measurement method
Measure from the middle point of shoulder width to the bottom edge for continuous shoulder, and from the highest point of shoulder to the bottom edge for closed shoulder (shoulder) Measure horizontally from 5 cm below the seam of sleeve ridge and rib seam Measure horizontally from the quarter of the back waist to the trouser hem Measure horizontally from 10 cm below the horizontal crotch measurement line (8 cm for children and middle children) GB/T 8878—2002
5.4.2.4.1 The dimensional change after washing test shall be carried out in accordance with the provisions of GB/T8629. Use 5A washing procedure. Number of test pieces: 3 pieces. 5.4.2.4.2 Drying: Use the hanging drying method. Use a rod to pass through the sleeves of the top to keep the chest hanging shoulder straight, and separate the two pieces from the bottom by hand. Fold the pants in half and hang them on the drying pole, with the horizontal part on the drying pole, and gently smooth them. Place the dried sample on a platform at a temperature of (20 ± 2) °C and a relative humidity of (65 ± 3)% for more than 4 hours, gently flatten the creases, and then measure. 5.4.2.4.3 Calculation and expression of results: Calculate the vertical or horizontal washing dimensional change rate according to formula (1), with a negative sign () indicating dimensional shrinkage and a positive sign (+) indicating dimensional elongation. The final result is rounded to the nearest 0.1. L1 = Lo × 100
Where:
A — vertical or horizontal washing dimensional change rate, %; L — the average value of the vertical or horizontal dimensions after washing; I. — the average value of the vertical or horizontal dimensions before washing. 5.4.3 The washing (including pigment printing) color fastness test shall be carried out in accordance with GB/T3921.3.
5.4.4 The test of color fastness to friction (including paint printing) shall be carried out in accordance with GB/T3920. The test shall be carried out in the vertical direction only. 5.4.5 The test of color fastness to perspiration
shall be carried out in accordance with GB/T3922.
5.4.6 The test of formaldehyde content
shall be carried out in accordance with GB/T2912.1. The test of special treatment products for printing and laminating shall be carried out on the printing and laminating parts. 5. 4. 7 pH value test
(1)
GB/T 8878 --2002
shall be carried out in accordance with GB/T7573.
5.4.8 The test of fiber content
shall be carried out in accordance with G3/T2910, GB/T2911, FZ/T01057 and FZ/T.73011. 5.4.9 Color fastness rating
Evaluate according to GB250 and GB251.
5.4.10 Grain skew test
Perform according to GB/T14801.
6 Judgment rules
6.1 Appearance quality
Calculate the non-conforming product rate according to the variety, color, specification and size. If the non-conforming product rate is within 5.0%, the batch of products is judged to be qualified; if the non-conforming product rate is above 5.0%, the batch of products is judged to be unqualified. The inner packaging mark error is calculated by piece, and the outer packaging error is not allowed. 6.2 Inner quality
6.2.1 The arithmetic mean of all the tested samples is taken for the marble bursting strength. If qualified, the batch of products is judged to be qualified. If unqualified, the batch of products is judged to be unqualified.
6.2.2 The arithmetic mean of all samples after washing shall be taken as the test result, and the average qualified shall be qualified. If there are shrinkage and reverse swelling test results at the same time, the arithmetic mean of the two shrinkage (or reverse swelling) samples shall be taken as the test result. If qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualified. 6.2.3 If the fiber content, formaldehyde content and pH value test results are qualified, the batch of products shall be judged as qualified. If unqualified, the batch of products shall be judged as unqualif
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